（学习视频分享：css视频教程）
在开发中，有时遇到需要给背景层加颜色遮罩的项目，现在特定总结一下给背景图层加颜色遮罩的方法。
方法一：通过定位叠加(注意层级)
.wrap1 { position: relative; width: 1200px; height: 400px; background: rgba(0, 0, 0, .5); } .wrap1 .inner { position: absolute; left: 0; right: 0; top: 0; bottom: 0; background: url(ban8.jpg) no-repeat center center; background-size: cover; z-index: -1; }
方法二：通过伪类元素叠加
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.wrap2 {
position: relative;
width: 1200px;
height: 400px;
background: url(ban8.jpg) no-repeat center center;
background-size: cover;
}
.wrap2::before {
content: "";
position: absolute;
left: 0;
right: 0;
bottom: 0;
top: 0;
background-color: rgba(0, 0, 0, .5);
z-index: 2;
}方法三：CSS3颜色叠加background-blend-mode:multiply;(正片叠底)
.wrap3 {
position: relative;
width: 1200px;
height: 400px;
background: url(ban8.jpg) rgba(0, 0, 0, .5) no-repeat center center;
background-blend-mode: multiply;
}拓展：背景模糊加颜色叠加
.wrap4 {
position: relative;
width: 1200px;
height: 400px;
background: url(ban8.jpg) rgba(0, 0, 0, .5) no-repeat center center;
background-blend-mode: multiply;
filter: blur(2px);
overflow: hidden;
}更多编程相关知识，请访问：编程入门！！
